gistfile1.pl

{
    package Parent;

    use strict;
    use warnings;

    sub new {
        my ($class, %args) = @_;
        bless {%args}, $class;
    }

    sub name {
        my ($self, $name) = @_;
        $self->{name} = $name if $name;
        return $self->{name};
    }

    package Child;

    use Moose;

    has parent => (
        is      => 'ro',
        isa     => 'Parent',
        handles => [qw/name/],
    );

    no Moose;

    sub BUILDARGS {
        my ($class, %args) = @_;

        $args{parent} = Parent->new(%args);

        return {%args};
    }

    __PACKAGE__->meta->make_immutable;
}

my $child = Child->new(name => 'hoge');
warn $child->name;